Add Linwood Butterfly to open source apps

[CodeDoctorDE]

Please read How to contribute before creating a submission.

Description

I created Linwood Butterfly, a small note taking app for everyone. Here I want to share it for everyone that everyone can benefit from my work: GitHub: https://github.com/LinwoodCloud/Butterfly Website: https://docs.butterfly.linwood.dev/

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Checklist

• [x] I read How to contribute
• [x] I edited the SOURCE.md file only
• [x] Added a link to the repo in the PR

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Feel free to add this badge to your repository after it's accepted to awesome-flutter.

<a href="https://github.com/Solido/awesome-flutter">
   <img alt="Awesome Flutter" src="https://img.shields.io/badge/Awesome-Flutter-blue.svg?longCache=true&style=flat-square" />
</a>

btw: i don't know whats the difference between premium and top, I added it to the top

[CodeDoctorDE]

Any updates? @Solido